Tempering of steel
Reheating quenched steel to a certain temperature and then using a certain method for cooling is called tempering. Its purpose is to eliminate the internal stress generated by quenching, reduce hardne...
Design Principle and Selection of Pressure Reducing Valve
1、 Working principle of pressure reducing valve Direct acting pressure reducing valve Figure 14-1a shows the structural diagram of a direct acting pressure reducing valve with an overflow valve (refer...
Achievements and Development Plan of Mineral Processing Technology in China’s Iron Mines
The total reserves of iron ore in China are about 46.232 billion tons (excluding Taiwan Province), of which the reserves above Grade C are about 22.031 billion tons [1,2], accounting for about 17.86% ...
Hot delivery and charging of continuous casting billets and their advantages
Compared with traditional production processes from molten steel to billets, continuous casting technology saves a lot of energy and materials. After the energy crisis of the 1970s, energy conservatio...
Reduction regulations for initial rolling
The reduction procedure of the blooming mill is the deformation system of rolling large section steel ingots into small section steel billets. The content includes the rolling passes from the ingot to...
Specification for connection of rotary valve drive equipment
At present, there are two main connection standards for valve drive devices in China, namely GB/T 12222-2005 “Connection of Multi turn Valve Drive Devices” and GB/T 12223-2005 “Conne...
Sustainability analysis based on domestic demand for ensuring national iron ore resources
Our country is now in a stage of accelerated industrialization and urbanization, with the development of the economy and the improvement of people’s living standards. The demand for energy and m...
Liquid steel stirring
Stirring of molten steel during refining outside the furnace. It homogenizes the composition and temperature of molten steel and promotes metallurgical reactions. Most metallurgical reaction processes...
Universal rolling mill
A profile rolling mill consisting of a pair of horizontal rollers and a pair of vertical rollers with the roller axes in the same vertical plane. The vertical roller can be an active roller or a passi...
Engineering quality of fire dampers and smoke exhaust valves
1. The main uses of fire dampers and smoke exhaust valves Most high-rise and other modern buildings are equipped with ventilation, air conditioning and smoke prevention and exhaust systems. Once a fir...
Zinc smelting
The modern production methods of zinc can be divided into two categories: fire method and wet method. Fire zinc smelting includes three main processes: roasting, reduction distillation and rectificati...
Hematite beneficiation equipment and techniques for beneficiation of high-sludge-poor hematite
A certain low-grade iron ore has large reserves, low iron grade, uneven particle size of iron minerals, and high mud content. It is a difficult-to-select poor hematite with severe mud formation. Based...
Water cooling line control system
The control system of the water cooling line must be completed through water volume, time and temperature control. The specific instructions are as follows: (1) Water volume control. The total amount ...
How to repair Handan Iron and Steel φ2400 single roller crusher
Two single-roller crushers were installed in the front area. The single-roller crusher is located at the discharge port of the sintering machine and crushes large sinter at around 1000°C into small in...
Optimized system for segmented shearing of bars after finishing rolling
Due to changes in billet quality during production, the total length of the rolled pieces is different, as well as the head and tail errors during the rolling process and the tolerance of the unit mas...
Blast machine in continuous casting machine
Due to the running resistance of the slab in the continuous casting machine, it will not automatically come out of the continuous casting machine. It needs external force to pull it out. For this purp...
What is Hastelloy tube?
Hastelloy Hastelloy is a tungsten-containing nickel-chromium-molybdenum alloy with extremely low silicon and carbon content. one. At present, it is mainly divided into three series: B, C, and G. It is...
Inputs for ore selection in Ansteel Dagushan and other concentrators (2)
Dong’anshan Mineral Processing Plant conducted a test to improve the concentrate grade in the No. 7 system from March 22 to March 29, 1978. According to the test results, when the output is basi...
How to prepare steam-cured bricks from a certain hematite tailings
In terms of resource utilization of tailings, a lot of research has been conducted at home and abroad, and good results have been achieved. These include comprehensive recovery of valuable elements fr...
serpentine oscillator
A device that swings the hot-rolled narrow strip erected by the twisted guide plate on the roller table in a serpentine manner. After the hot-rolled narrow strip is rolled out of the last stand of the...
Specification for acceptance of construction quality of steel structures GB50205-2001
According to the requirements of our Ministry’s “Notice on Issuing the Plan for the Formulation and Revision of National Standards for Engineering Construction from 2000 to 2001” (Jianbiao [2001] No. ...
Advantages and Disadvantages of Stelmo Controlled Cooling Process
(1) The advantages of the Stelmo cooling process are: the cooling speed can be controlled manually, which makes it easy to ensure the quality of the wire; compared with other controlled cooling proces...
Reasons for implementing microalloying in steel bar production
It has been half a century since aluminum was used to refine the grain size of steel and improve its strength and toughness. In a broad sense, there are seven or eight types of microalloying elements,...
High strength plastic alloy pipe function
Performance index requirements for high-strength plastic alloy pipes Plastic alloy tube, also known as plastic alloy composite communication tube or plastic alloy power cable protection tube. It uses ...
Experiment and Application of Iron Ore Flotation Reagents
Based on the increasingly difficult selection of iron ore in China, the important position of flotation skills in iron ore beneficiation is highlighted, and the current research status and application...
Introduction to Nonferrous Metals Knowledge
1、 Classification of non-ferrous metals (1) Non ferrous pure metals are divided into five categories: heavy metals, light metals, precious metals, semi metals, and rare metals. (2) Non-ferrous alloy C...
reactive wire drawing
Reactive wire drawing is a drawing method that applies a tensile force Q in the opposite direction of the drawing force P at the input end of the metal wire and the drawing force Q at the output end. ...
Nozzle design considerations
It is mainly determined based on the production capacity of the steelmaking workshop, raw material conditions, oxygen supply capacity, water cooling conditions, and the capacity of the furnace gas pur...
Sustainable analysis of domestic production of sulfuric acid plants using pyrite
Abstract: This article introduces the current situation of domestic production of large-scale sulfuric acid equipment from pyrite in China. In response to the high content and fine particle size of ma...
GB 3531-1996 Surface Quality of Low Alloy Steel Plates for Low Temperature Pressure Vessels
The steel plates are delivered in the normalized or normalized plus tempered state. The surface quality of the steel plate shall be free from defects such as cracks, cracks, bubbles, scars, folds, and...
Conduct trial rolling after changing rolls and grooves
The most common problems with new groove trial rolling are difficulty in biting and slipping of the rolled piece in the pass after biting, resulting in steel stacking accidents. In order to successful...
How to make bricks from iron tailings
1、 Production of unburned bricks from iron tailings Ma’anshan Mining Research Institute has successfully produced unburned bricks using tailings from Qidashan and Waitoushan iron mines. This unb...
Advantages of oil-free vacuum pumps in industrial processes
Manufacturers in various fields are always looking for ways to increase profit margins – with the aim of improving process efficiency without affecting quality and safety. This article introduce...
Forging drawing
A diagram designed to adapt the parts to the requirements of the forging parts process. It is drawn on the basis of the part drawing, with machining allowances and forging tolerances added. The forgin...
What is the calculation method for the main technical and economic indicators of electric furnace ferroalloy smelting
1、 Quality Policy for Electric Furnace Ferroalloy Products The quality of electric furnace ferroalloy products is a policy that reflects the level of electric furnace ferroalloy products and smelting ...
Recrystallization annealing
Heating steel produced by cold working methods such as cold rolling and cold drawing to a certain temperature higher than its recrystallization temperature, holding it for a certain period of time, an...